5G Service Request Paging via SBA for PDU Session Activation
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Solution Overview
Problem
The 5G system architecture lacks a full Service Based Interface (SBA) for network functions, particularly in paging and service requests, leading to inefficiencies in network communication.
Innovation Solution
An evolved network architecture is implemented with a full SBA, enabling network functions to expose services through a system of computers configured with software, firmware, or a combination of hardware, to perform operations such as receiving information, determining the state of a wireless transmit/receive unit (WTRU), and initiating radio resource establishment for PDU sessions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a full Service Based Interface (SBA) architecture is implemented for network functions, then network communication efficiency and functionality are improved, but device complexity and implementation difficulty increase
Solution Approach 1:
The patent segments network functions into modular Service Based Interface components, where each network function (NF) is independently implemented and communicates through standardized service interfaces. This allows the complex SBA architecture to be broken down into manageable, reusable service modules that can be developed and deployed independently, reducing overall system complexity while maintaining full SBA functionality.
Solution Approach 2:
The patent implements universal service interfaces that enable different network functions to communicate through common standardized protocols and message formats. The Service Request and Paging mechanisms provide multi-functional capabilities across various NFs (AMF, SMF, UPF, etc.), allowing a single interface design to serve multiple communication scenarios, thereby improving efficiency without proportionally increasing complexity.
2Adaptability or versatility
If network functions expose services through full SBA for paging and service requests, then network functionality and adaptability are improved, but implementation difficulty and operational complexity increase
Solution Approach 1:
The patent introduces intermediary components such as the Service Management Function (SMF) and Access and Mobility Management Function (AMF) that mediate between different network functions. These intermediaries handle the complexity of service exposure and interaction, providing standardized interfaces that simplify operation while enabling full SBA functionality. The paging mechanism acts as an intermediary notification system that coordinates service requests across multiple NFs without requiring direct complex interactions between them.
Solution Approach 2:
The patent implements feedback mechanisms through acknowledgment messages and status notifications in the service request and paging procedures. Network functions receive feedback about service request states, paging outcomes, and data delivery status, enabling automated error handling and retry logic. This feedback loop reduces operational complexity by providing the system with self-correction capabilities rather than requiring manual intervention.
3Reliability
If service requests and paging procedures are enhanced with full SBA, then data delivery reliability is improved, but processing time and system overhead increase
Solution Approach 1:
The patent implements preliminary actions by pre-establishing service context information and PDU session states during initial network attachment and session setup. The network functions store and maintain service request state, WTRU reachability information, and session context in advance, so that when paging or data delivery is needed, the system can quickly retrieve pre-computed information rather than calculating it in real-time, thus improving reliability without significant time penalty.
Solution Approach 2:
The patent implements dynamic state management where network functions adapt their behavior based on current WTRU state (connected, idle, inactive). The paging mechanism dynamically adjusts its operation based on service request outcomes and WTRU reachability. This dynamic approach allows the system to optimize processing time by taking different paths based on real-time conditions while maintaining reliable data delivery through appropriate state transitions and acknowledgments.
Data Source
AI summary
In some implementations, a method implemented in a first NF may include receiving first information from a second NF during a PDU session establishment procedure or a PDU session modification procedure, where the first information includes an identifier of a third NF. The method may include storing the received first information associated with the PDU session. The method may include receiving a downlink (DL) data notification and at least one of a plurality of second information from the third NF, the DL data notification including DL data to be delivered using the PDU session to a wireless transmit/receive unit (WTRU). Moreover, the device may include determining a state of the WTRU. Also, the device may include sending a request to the second NF to initiate radio resource establishment to activate user plane (UP) resources for the PDU session when it is determined that the WTRU is in a connected state.